is,are was were的区别？

Question

如题所述

Answer 1

did是助动词do和does的过去式，而was/were是be动词am、is/are的过去式。
一个句子中，如果没有be动词，发生动作要用助动词do或does.
例如：I
am
a
student.
问句是：Are
you
a
student?
有be动词所以直接用are提问。
I
worked
in
an
international
company
2
years
ago.
句中没有be动词，所以要用助动词代替，问句是：
Did
you
work
in
an
international
company
2
years
ago?

Answer 2